You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Lee.

ASSISTANT: How may I assist you?

USER: I want to travel from BOS to HOU. Can you book a flight ticket for me?

ASSISTANT: Ok, please mention your travelling dates to go.

USER: I want to fly on 03/17 and 03/19.

ASSISTANT: There is no flight found on your preferences.

USER: That's ok.

ASSISTANT: Sorry for the inconvenience. Thanks for contacting us.