You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Welcome to flight travelling agency, what assistance that you are looking from my side?

USER: I am very busy with my meetings, so I am not able to complete my trip. Can you please help me in changing my existing reservation?

ASSISTANT: It's alright and I have to know some basic information like name from your side, can you please share it?

USER: My name is William Gonzalez.

ASSISTANT: Ok, I have noted your information in our portal. Now give me a moment to check it.

USER: Ok.

ASSISTANT: Sorry for the delay in my response, I have checked with your name in our booking portal and I have got the information that no user name has done booking and register in our booking site.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for choosing us.