You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I am Edward Moore, due to health issues I would like to change my existing reservation, so can you help me for this?

ASSISTANT: Ok, please wait for a while, I will check your name in our records and revert you back.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry Edward, there is no reservation found with your name.

USER: Oh! it's ok, no problem. Thank you for your services.

ASSISTANT: It's my pleasure.