You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jennifer Mitchell.

ASSISTANT: How can  I assist you today?

USER: Can you please help me with flight ticket book from New York to Houston?

ASSISTANT: Sure, can you please share your travel dates?

USER: Sure, I need to travel on dates of 05/17 and 05/19.

ASSISTANT: Could you please help me with the airport codes?

USER: Sure, I would like to travel from EWR to HOU.

ASSISTANT: Let me check for the availability of flight.

USER: Sure, take your time to check.

ASSISTANT: Jennifer, I am sorry to inform you that there is no flight available at your request.

USER: Oh! It is sad to hear. I need to choose another agency this time. Anyway, thank you for your time.

ASSISTANT: Sorry for the inconvenience. Thank you for contacting us, have a great day.