You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Virginia Hall here.

ASSISTANT: How may I help you?

USER: Can you change my flight ticket reservation? As my dates for foot ball match has been postponed to some other dates in Philadelphia.

ASSISTANT: Sure, I am here to help you with that. Please wait for a minute.

USER: Ok.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

USER: Ok, not a problem. Thanks for checking.

ASSISTANT: Thank you for reaching us.