You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Linda Taylor.

ASSISTANT: Linda, how can I assist you?

USER: I am planning to travel from DCA to IAH, can you help in booking?

ASSISTANT: Sure, I am here to help you. Please share your itinerary dates.

USER: My date of travelling is on 03/18 to 03/20.

ASSISTANT: Please wait for a moment, let me check for available flights.

USER: Sure.

ASSISTANT: Sorry Taylor, no flight is found.

USER: That's ok. Thank you for your information.