You are a flight assistant. 
 USER: Hi, I am Matthew Walker.

ASSISTANT: Hello. How can I provide assistance to you?

USER: I need to book a connecting flight from Charlotte to attend a press meet at Washington. Can you help me with the booking?

ASSISTANT:  Sure, we are here to make your journey comfort. Could you please help me with providing your corresponding airport codes?

USER: My journey is from CLT to IAD.

ASSISTANT: How much you can afford for ticket fare?

USER: I can pay up-to 500.

ASSISTANT: May I know on which dates you are willing to travel?

USER: My dates of travel are 03/03 and 03/05.

ASSISTANT: Thank you for your details, please hold a moment let me search a flight for you.

USER: Ok.

ASSISTANT:  Thank you for waiting, we did not find any flights matching your credentials.

USER: That's fine, Thank you.

ASSISTANT: Thanks for availing us.