You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brenda Phillips.

ASSISTANT: How may I help you today?

USER: I want to meet my old friend in Philadelphia.Can you help me to book a ticket from HOU to PHL?

ASSISTANT: I will help you with that. Can you please provide your journey dates?

USER: I would like to fly on 05/19 and 05/21.

ASSISTANT: Give me a minute, I will get back with your flight details.

USER: Ok, take your time.

ASSISTANT: I am sorry to say that there is no flight found.

USER: That's ok. Thank you for checking.

ASSISTANT: Thank you for contacting us.