You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Benjamin Lopez.

ASSISTANT: Welcome to our UA travelling agency.

USER: Thank you. I need to change my reservation which I have done earlier to reach Wander law but unfortunately it has closed due to heavy rains. Will you please help me in changing my reservation?

ASSISTANT: Lopez, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Lopez, there is no reservation found on your name to change your reservation.

USER: Oh! It's ok, no issue. Thank you for your help.

ASSISTANT: You are welcome.