You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how shall I help you?

USER: My name is Brandon Harris. Owing to emergency, I need to change my recent reservation. Please help me with that.

ASSISTANT: Sure, I can help you with that one.

USER: Thank you.

ASSISTANT: Give me some time to check it.

USER: Sure.

ASSISTANT: For this user name there is no reservation found in our portal.

USER: No problem, thanks for your information.

ASSISTANT: You are most welcome and have a nice day.