You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My plan to visit Houston has been postponed, I would like to change my existing reservation.

ASSISTANT: Sure, may I know the name which has been used for reservation.

USER: My name is Stephanie King.

ASSISTANT: Ok, wait a moment.

USER: Sure, take your own time.

ASSISTANT: King, there is no reservation found under your name.

USER: Ok, no issues.

ASSISTANT: Ok, thank you for choosing us.

USER: Thank you for your help.