You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Melissa Hill. I need to visit Global hub in Washington DC as there is interviews going on. Will you please book a flight ticket?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travel dates are 01/16 and 01/18.

ASSISTANT: Ok, can you tell me your travelling airport codes?

USER: Sure, airport codes are IAH and IAD. Please check with connection as 1.

ASSISTANT: Ok, give me a moment.

USER: Sure, take a time.

ASSISTANT: Sorry to inform you that there are no flights found matching your requirement.

USER: Oh! It's ok fine.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.