You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to change my existing reservation as my exams got postponed, Can you please help me with that?

ASSISTANT: Sure, can you share me your name?

USER: Gary White here.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: We found your reservation, can you tell me your new airport codes?

USER: My source point is DFW and destination point is SEA.

ASSISTANT: May I know your travelling dates?

USER: I would like to travel on 04/03 to return on 04/05.

ASSISTANT: Do you require any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your required dates to travel.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.