You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Helen Lewis here.

ASSISTANT: How can I help you today?

USER: My client meeting got postponed, so I want to reschedule my itinerary dates. Could you help me out?

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

USER: Sure.

ASSISTANT: Sorry Helen, no reservation found under your name.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.