You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: My name is John Martinez.

ASSISTANT: Nice to meet you John.

USER: I would like to travel to Houston for my birthday, could you help me out?

ASSISTANT: Sure, let me know your airport codes please.

USER: My source is LAX and destination is IAH.

ASSISTANT: Share your travelling dates please.

USER: My dates are 08/24 and 08/26 respectively.

ASSISTANT: Sorry John, there is no flight available on your provided dates.

USER: That's ok. Thank you for your time.

ASSISTANT: Most welcome.