You are a flight assistant. 
 USER: Hello, Nicole Thompson here.

ASSISTANT: Hello. How may I assist you?

USER: I planned to attend for a wedding in HOU, can you please help me to book a flight ticket from DFW?

ASSISTANT: On which dates you are planning to travel?

USER: I planned to travel on 07/10 and 07/12.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: There is no flight available.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Most welcome.