You are a flight assistant. 
 USER: Hi. Justin Lopez here.

ASSISTANT: Hello, how can I help you?

USER: As I am a researcher on plants, I am planning to visit Washington botanical park. Please help me with that.

ASSISTANT: Sure, I am here to help you. May I know your airport abbreviations?

USER: Please find me a direct flight from Charlotte, CLT to Washington, IAD.

ASSISTANT: Sure, may I know your travelling dates?

USER: Well, I am planning to depart on 05/06 and return on 05/08.

ASSISTANT: Please wait for a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry there is no direct flight available on your requested dates. Shall I proceed?

USER: That's ok, I will try to go by road way.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your valuable time.