You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joshua Robinson.

ASSISTANT: How may I guide you?

USER: Can you help me to change my reservation to next week?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Joshua, no reservation has been found on your name in our database.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for choosing us.