You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Edward Rodriguez here. I want to change my existing reservation due to my office work, can you please help me today?

ASSISTANT: I am happy to help you with that. Please wait for a minute.

USER: Ok, please check soon.

ASSISTANT: I am sorry to say that there is no reservation found under your details.

USER: Oh! That's sad to know, thank you for checking anyways.

ASSISTANT: Thank you for reaching us.

USER: You are most welcome.