You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be of your help?

USER: Owing to an emergency I need to reschedule my journey dates. Can you help me to changing may journey dates?

ASSISTANT: Sure, could you please share your name?

USER: I am Nicholas Clark.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Unfortunately there is no reservation found according to your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for picking us.