You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Christine Martin.

ASSISTANT: Ok.

USER: I am looking to book a flight ticket from LAS to PHL to meet my friend. Can you help me for booking a flight ticket?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travelling dates are 06/26 and 06/28.

ASSISTANT: Please give me a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a great day.