You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to modify my travelling dates, can you please help me in changing a ticket?

ASSISTANT: Sure, please mention the name for checking the reservation.

USER: My name is Sharon Anderson.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: There is no reservation found under your name.

USER: It's ok, thank you for searching.

ASSISTANT: Welcome, have a great day.