You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please tell me how may I help you?

USER: I am looking to modify my travelling dates in the previous ticket which is booked in the last week. Can you please help me in changing?

ASSISTANT: Sure, I am here to help you. Can I have your name to check the ticket status?

USER: Sure, I am Debra Davis.

ASSISTANT: Ok, I will put the conversation on hold for a minute. Is it ok for you?

USER: Ok, no problem.

ASSISTANT: Sorry to tell you, there is no reservation on your name in our data.

USER: That's fine, thank you for your information.

ASSISTANT: You are welcome. Thank you for reaching us.