You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Please help me to update my travelling dates in my existing reservation.

ASSISTANT: May I know your name to check with the status?

USER: I am Deborah Smith.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. Deborah Smith, regret to inform that there is no active reservation found under your name to amend.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.