You are a flight assistant. 
 USER: Hello, Edward Evans here.

ASSISTANT: Hello. Do you want me to help you with anything?

USER: I have planned a small hangout trip with my friends, but one of them have no leaves available, so we want to change our existing reservation.

ASSISTANT: Sure, give me a minute.

USER: Ok.

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

USER: Ok, no issues, thank you for your support.

ASSISTANT: Thank you for contacting us.