You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am very busy with my meetings, so I am not able to complete my trip. Can you please help me in changing my existing reservation?

ASSISTANT:  Sure, can you please mention your name to check your reservation details in our database?

USER: Ok, my name is Christine Thomas.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, I did not find any reservation by your name in our database.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us.