You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Christine Thomas here.

ASSISTANT: How may I help you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Ok, wait a moment.

USER: Sure.

ASSISTANT: There is no reservation found on your name.

USER: Ok, not a problem.

ASSISTANT: Thanks for choosing us.

USER: Thank you.