You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Frank Thompson.

ASSISTANT: What can I do for you today?

USER: Can you please book a flight ticket from PHL to DCA?

ASSISTANT: Sure, provide your departure and arrival dates?

USER: Sure, I need to travel on dates of June 03 and June 05.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure, take your time. Please make sure that normal cost airlines.

ASSISTANT: There are no flights found on your requested dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.