You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Evening.

USER: Good Evening.

ASSISTANT: How can I succour you?

USER: In your website, I could not find the option of change reservation. Can you do this behalf of me?

ASSISTANT: Sure, I'll be gleeful to help you. Can you please provide the name on which the reservation has been confirmed?

USER: I have booked my ticket with my name of Donald Mitchell.

ASSISTANT: Thank you for the co-operation, please wait for a split second to check your reservation status and revert you back soon.

USER: Sure, I will wait for your response.

ASSISTANT: Have you done the reservation on the name that you have provided?

USER: Yes.

ASSISTANT: Then sorry Mitchell, I'm unable to find your name in the reservation list.

USER: That's fine, may be my friend has changed my reservation. Anyways, thank your your crucial time.

ASSISTANT: Ok, is there is anything else I can help you with?

USER: Nothing else, thank you.

ASSISTANT: Thank you and have a nice day.