You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I made a reservation earlier to visit Dallas but due to some issues it has been postponed. Can you help me in changing my reservation?

ASSISTANT: Sure, I am ready to help you. May I know your name?

USER: Thank you. I am Ruth Hall.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for choosing us.