You are a flight assistant. 
 USER: Hello. Shirley Walker here.

ASSISTANT: Hello. How may I guide you today?

USER: Can you change my flight ticket reservation? As my wedding date have been postponed in which was to be held in a church in Houston.

ASSISTANT: Sure, I will help you with that. Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.