You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me out? My name is William Gonzalez.

ASSISTANT: This is a flight booking agency and definitely, I will make sure that this gets resolved for you.

USER: Thank you.

ASSISTANT: Thanks for providing your name and wait for a moment please.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting. I have searched for your flight reservation but sorry I could not find it.

USER: Not an issue, thank you for the information.

ASSISTANT: Thanks for contacting us.