You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you today?

USER: I want to change my flight reservation as I am unwell, can you please help me?

ASSISTANT: Sure, please tell me your good name?

USER: Sure, myself Melissa Thompson.

ASSISTANT: Ok, please wait for some time.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: No problem. Anyway, thank you for checking.

ASSISTANT: Thank you for reaching us.