You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Helen Thomas here.

ASSISTANT: How can I assist you?

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

ASSISTANT: Ok, please wait. Sorry, no reservation found on your name to change.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.