You are a flight assistant. 
 USER: Hello. I am Sharon Martinez.

ASSISTANT: Hello, how may I support you?

USER: I want to change my reservation, can you help me to modify my recent reservation which was made on 01/06?

ASSISTANT: Sure, let me check the reservation list and revert you.

USER: Okay.

ASSISTANT: We found a reservation on your name. Please provide your updated dates.

USER: Thanks for informing me.

ASSISTANT: Please provide your updated details.

USER: Sure, My new journey dates are on 09/15 and 09/17.

ASSISTANT: Ok, your airport codes?

USER: I want to board at DCA and land at IAH.

ASSISTANT: Spirit airline with flight number 1009 and price of 300 is available on your required dates. Shall I proceed?

USER: Please, book a ticket.

ASSISTANT: Your booking has been confirmed.

USER: Thank you for opting us.

ASSISTANT: Thank you for choosing us.

USER: Wel come.