You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Melissa Hall here.

ASSISTANT: How can I help you?

USER: Can you change my flight ticket reservation? As my football match has been postponed to some other date in New York.

ASSISTANT: Sure, just a moment please.

USER: Ok.

ASSISTANT: I am sorry no reservation found on you name.

USER: Not a problem. Thank you.

ASSISTANT: Thank you.