You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my reservation, can you please help me?

ASSISTANT: Sure, may I know your name?

USER: My name is Janet Martin.

ASSISTANT: We found your reservation, can you share your trip dates?

USER: My trip dates are Dec 30 and Jan 01.

ASSISTANT: May I know your airport codes?

USER: My airport codes are OAK and IAH.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.