You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Ruth Parker here, I want to update my trip dates of my existing reservation as my exam got postponed. Can you help me in changing.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: That's Ok. Thanks for your response.

ASSISTANT: Thank you for reaching us.