You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to alter my recent reservation due to some personal issue. Please help me in changing my reservation.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: May I know your name to check with existing reservation?

USER: Myself David Allen.

ASSISTANT: Your reservation is found. Please share your new travelling dates.

USER: My new travelling dates will be from 05/03 to 05/05.

ASSISTANT: Can I know your airport codes?

USER: My airport codes are from OAK to AUS.

ASSISTANT: Do you need any connection limit?

USER: Yes, I need a single connecting flight.

ASSISTANT: Could you share me your preferable timings?

USER: No, there is no specific preference regarding time.

ASSISTANT: May I know your class preference?

USER: I can adjust in any of the class.

ASSISTANT: Do you need any specific Airline?

USER: No.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: There is a flight in economy class with United Airlines and ticket fare of 100. Shall I proceed?

USER: That's perfect, please proceed with the booking.

ASSISTANT: Your ticket is reserved with flight 1013.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.