You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to change my reservation to next week, can you help me out?

ASSISTANT: Sure, will you mention the name for checking the reservation?

USER: My name is Charles Walker.

ASSISTANT: Please give me a moment. There is no reservation found under your name.

USER: Ok, no issues. Thank you for your time.

ASSISTANT: Welcome, have a great day.